Fuel-supply system



Patented pais, 1926.

"UNITEDJSTATES f "assai 'PATENT orifice.

JOHN I. HUNT, OF -DYTONQ QHIO, ASSIGNOR T0 GENERAL MOTORS RESEARCH COR.- PORATION-`0F DAYTON, ORIG, A. CORPBATION 0F DELAWARE.

FUEL-SUPPLY sventura.

.-spplicatlon filed December 3, 1823. Serial No. 678,127.

To all whom t lmay concern.'

Bc it known that I, JOHN H. HUNT, a-

citizen of the United States of America, residing at Dayton, county of Montgomery, and State of Ohio, have invented certain new and useful vImprovements in Fuel- Supply Systems, of which the following is vention to control-the operation ofthe fuel supply device for internal combustion engines so that said devices will be operated to provide a sufficient amount of fuel at both high and low engine speeds.

This object is accomplished in the present 4invention by controlling the operation ofthe fuel pump by means of the circuit control# ling relay which assumes one. position when the ongineis operating at slow speeds and another position when the engine is operating at high speeds. Means are associated with this circuit controlling relay for cham,- i :g the ratio of the frequency of pump operation to engine speeds, sfothat at slow engine speeds the ratio between lthe pump and engine operations will be increased and the ratio between the pump and engineoperations will be decreased when the en ne isv runnin at a predetermined higher speed.

vFurther objects and advantages .of the present invention will be apparent from the following description, reference being had to lthe accompanvingv drawing the singlel ligure of which shows'a, preferred embodiment of one f prm ofth'e present invention. Rc-torri 'to the drawing which diagrammatically Iillustrates the various elements of -the device and their respective electrical connections, the numeral 2O designates the electric incl pump comprising a casing 21 and .end covers 22 and. 23. l The upper end cover 22 has channel 24 whichis in communication with the inside of the pump and the carburetor not shown. The lower end oever 23 has a projection mounted or 'formed integral therewith, said projection being rovided with an internal passage 25 whic is also in conimunication with the interior of the pump and with the main fuel tank not 'shown on the drawing. A check valve 26 is provided in the passage 25, said check valve being operable to permit fuel to flow from the main fuel tank through the passage 25 into the pump but will prevent fuel flowing from the pump back into the tank. A. cylinder 27 isinterposed between both ends 22 ,and 23 inside the casing 21. A portion of the bottom end cover 23 projects up into the cylmder 27 and forms what may be termed the stationary core of the magnet winding 28 which surrounds the `cylinder 27. Holes 29 are provided in this core which provide communication between the chamber above the check valve 26 and the inside* of the cylinder 27. The piston 30 slidably posi.. tioned in the cylinder 27 has a check valve 3l at its upper end, said check valve controlling communication between the space in the cylinder above the piston and the interior -hollowed out portion of the piston. Interposed between the piston and a projection 32 formed on the bottom cover 23 there is a spring 33 which normally tends to hold the piston in its upper position in the cylinder. However, when the coil 28 is energized by ,permitting current tolow therethrough, the core portion of the cover 23 will become energized and attract the piston, moving it downwardly in tho cylinder against the 'affect of the spring 33. Upon the upward movement of the piston by means of the s ring 33, the check valve 31 will be forced own against its 'seat and thecheck valve 26 will be liftedvthereby permitting fuel to iow from the fuel tank through the passage 25, past the check valve 26, through openings 29 into the hollowed out portion ofthe piston, tending to lill this portion of the piston. On its downward travel by magnetic attraction, the piston will' cause pressure to be exertedupon the valve 26, closing the same, this oressure causing the valve 3l to be operate thereby permitting fuel inside the piston to flow past the valve 3l into the space above the piston and Within the cylinder 27, through the passage way 24 to the carburetor.

The engine driven circuit controlling means for causing the pump to be operated includes the pump timer which is adapted to operate or cause pulsations of the pump at a, certain ratio relative to a cycle of engine operation and the ignition timer which will cause the ratio 4between the pulsationsot the lpump and a cycle of engine operation to be increased, ovor"tliose caused by the pump timer. -The pump` timer designated by the numeral comprises a single lobeycam 36 mounted on and driven by the shaft 37 shown `,in,dotted lines. This shaft may be connected and driven by the engine in any suitable manner. A contact arm 38 ucrumed at the point 39 carries a contact 40, said Contact being adapted to be moved into engagement `wit a stationary contact el, once during each revolution of the cam 36 The ignition timer designated b" ythe numeral 42 comprises ,a cam 43 provided with a plurality of lobes 44. rlhis cam is also mounted on and driven by the engine driven shaft 37. A Contact arm 45 fulcruined at the oint 1i@ carries a contact member 47 whic is, ada ted to be moved into engagement withv t e stationary Contact i8 four times during one revolution of the cani 43. It .may he stated here that the lobes on 4the cam 43 will vary directly with the number of lcylinders of the engine, so thatin sincylinder engines, six lobes will be provided, eight-cylinder engines, eight lobes and etc. The en ine .has a generator connected thereto w ich is adapted to charge the storage battery 51 when the generator is being driven by the engine at a sufiicient rate of speed to cause 'a current output therefrom. The means responsive to the generator output to change the ratio between the cycles of pump and engine operation includes a relay 52 which comprises a frame 53 supporting a core 5ft. An armature 55 is also supported by the frame 53 ulorurned at the point 56. One end of the armature is adjacent to the free end of the core 5e while the other end of the armature carries a contact element 57 adapted to engage with the sta tionary Contact 58., A spring 59 tends to holdthe. armature in its normal position away froin'the end of the core 54:. Two windings 60 and 6l are associated with the core 54, these windings having a common connection to the wire 62, the winding 60s however, being grounded While the winding 6l is connected with the armature 65 in any suitable manner. The function of this relay is to connect the storage battery 51 when the generator is driven at a suti'icient speed to provide a current output for charging the battery. After arriving at this prede- 'termined speed, or more-specifically, when the output of the genera-tor reaches a predetermined value, current will first new from vthe generator, through the Wire 62, Winding 60, bach to the generator via the ground connections. This will cause the core 54 to become energized and attract the arma ture 55 against the a'ect ot 'the spring 59 to hold it in normal position, thus inlovement of the armature 55 toward the K"ore will cause the contact 57 to e contact 58.V New current wili :dow arena the generator 'through the wire dit, cori armature 55, thence across coni. and 58, through thek fiato the l .ry 5l and bach to the generator ria" the ground connections. Current through the coil 6l will cause said eoii to so e gine the core 54 so that the armatore 55 w, be held in this contact c'iosing position es tong es the genera-tor is providing a lsuttlicient amount oi? current to build up in the core 5i t/oorercome the attent or the spring 59. f

The means responsive 'to the output oii the generator, or more specificaiiy, the in,- oludes means to change the ratio 'between the cycles of pump and engine operation so that when the generator output is of a sufricient value to charge the battery, the circuit operating the pump will be controlled by the regular ump timeru However, when the output of t `e generator is not suiiicie t to charge the battery, or incre specifica "y when the'-5 cnrrent output o' the is insuiiicient to hold the relay in cont-act I closing position9 the lump circuit is trolled by the ignition timer.

This aforementioned ineens conn rT common contact arm secured to a prei jection 7l formed on the armature. 'e contact arm 70, however, is insulated t' om said armature.

When the generator output is insufficient to charge the battery,l 'the relay amat will assume a position as is shown on the drawing. Here the contact erin 70 is in engagement with the stationary contact which in turn is connected with the contact,

arm et'of the ignition tin-1er by .means oit a wire 78. Thus it will be seen that while the engine is driving the generator at a sneed Where the output of the generator is usuitn ticicnt to charge the battery, the pump open ating circuit will be as follows: from the battery 5l, through the wire G27 through wire 74, across the regular ignition switch 75, which closes the circuit between 'the source of electrical energy and the ignition coil 76. After having passed through the switch 75, current will flow through wire the invention. Assuming .that'tlie speed of the engine han.

be four to one in the present embodimentof increased and that the generator' :50 is being V,driven at a sufficient speed to cause the relay filo/connect `the generator .with the battery,

vin combination, an

the operation .Q-ftleielay t'o complete this connectlonfyfiil"have 'shifted the common contact. 'r'nif'l" loutzof vengagement with the 'stationary contact 72 and intoengagement with'thef stationary Contact 80. The pump circuit VWill'lie completed through the follow ingjpathcflbm-the contact 58 through which the charging current tov the'battery is now flowing current 4will' flow through the wire 74, across the ignition switch 7 5, thro'gh wire 77; pumpv controlling winding 28, wire v78 to the one-..fcontaet arm 70, through contact 8O to'tlleoontact arm 38 oi the pump timer 35, across' contacts 40 and 41 haci; to the generator via ,the ground connections. From this it may be seen that upon each revolution ofthe engine driven shaft 37, the contacts i0 and 41 will be engaged and broken once so that one pulsation Awill be gyen the pump for each single revolution o the engine. driven shaft 37.

Thus the relay 52 while being; operated to either close or open the circuit between the generator and the storage hattery hy a predetermined high or low generator current output respectively, will automatically bring into affect either the regular pump timer or lthe ignition timer-to decrease or increase the ratio between the pump pulsations and a cycle of engineV operation respectively.

- lVhile the form ot' en'ihodiinent of the invention as herein disclosed, constitutes a pre*- ferred form, itis tobe understood that other forms might be adopted, all coming within `the scope of the claims which ifollouzr VVhaiiscaimed is as follows:

LA. fuel supply device for an internalcombustion engine comprising in combination, an electromagnetI pump; a plurality of means for causing the pump todae energized intermittently at different frequencies relative to engine operations; and means conn trolled by the'speed of the engine for selecting one of said. puinpcontrolling means.

2. A fuel supply device for an internal-f combustion engine comprisingr in conihinaf tion, an electromagnet pump; e plurality ot means for causing,Y the pump to loe energized intermittently at diilerent frequencies relan tive to engine operations; and engine-ciontrolled means for selecting one ot' said pumpcontrollingl means.

3.A fuel supply device for a multicylinder internal-combustion engine comprising eiectroinagnet fuel pump; engine driven circuit controlling means for causing the pump to he operatedA and including interrupters, one of which 1s operated more frequently than the other vduring e complete engine cycle; and means for selectively connecting 'the interrupters with the pump, i

Il. A fuel supply' device for an internal combustion engine comprising in combina# tion, an engine driven generator; an electric fuel pump; engine dri ven circuit controllingr means for causing the punip to he operated; and means responsive to the output of the generator, adapted to control the circuit connections to the circuit'controllng,y lucani -to change the ratio between, the pump pulsations and the cycle of engine operation.

5. 'uel supply device for a multi-cylinder internal combustion engine comprising in combination, an electric fuel pump; cngine driven circuit controlling means for causing,- the pump to hef operated, and including interrupters one of which is operated more frequently than the other during an engine cycle; ineens brought into eect during a predetermined portion of the speed range of the engine, to shift the pump cir# cuit from the more frequently operated interrupter to the less 4frequently'operated one duringF acceleration and to reverse the shift during' deceleration.

.(3. A fuel supply device tor an internal combustion engine comprising in combination, an lengine' driven generator; an electric fuel pump; engine driven circuit controlling means -for causing the pump to he operated and including' interrupters one of which is operated more often than the other duringI an engine cycle; means brought into eilect when the output of Ithe generator decreases to a predetermined value to cause the interrnpter'whieh operates more often to operate the pump; and means for connecting the pump With the circ-uit interruptor which operates less frequently per cycle-ott engine operation when the generator output increases to a predetermined. value.

7. n, fuel supplyv device for an internal combustion engine comprising in combination; an electric pump; an engine driven generator; a storage battery; engine driven circuit interrupters, oney of which operates 'gnore oftenthan the other during an engine cycle; automatic controlling means 'for connecting the generator with the battery .at a, predetermined speed of the engine; `means associated with saidvautomaljic controlling means 'for substantially simultaneously conneeting the'pump to the interrupter which operates less frequently, and for connecting thepiunpyvith the interruptor which o era'tesmore-frequently per engine cycle w en the said' controlling;T means operates to disconnect the generator from the battery.

'8. A. fuel supply device for an internal combustion engine pump, an engine 'drrven generator; a storage battery; an electrical relay controlled by the output of the genera-v tor for connecting said generator with the 4.2L i Leeeeee battery when the output of the generatoi7 reaches a predetermineel velue; engine driven timers including make and break clevices in one of which the said device is adapted to be operated more frequently per engine revolution than in the other; and means associated with the relay for connecting the pump with the timer that is operated more frequently, when the relay is ai fected to discontinue the flow of current i'oni the generator to storage battery :incl adapted to connect the puin with the time? less frequently operated W en the relay is eifected to close the circuit connections between tlie generator and storage battery.

9. A `fuel supply device for en internal combustion engine provided with an electric ene/'tor loompiisin' in combination e,

stoi' ge battery; e relay controlled by the generator for connecting-said generator with the vbattery when the output of the generetor reaches e predetermined velue; en electric fuel pump; an engine driven ignition timer including an interrupter adapted to be operated. a predetermined number of times per engine revolution; an engine driven ump timer including e circuit interrupter adapted to be operated less frequently per engine revolution than the ignition iiitei'u :im ruptei; a relay operated switch foi' connecting the fuel pump With the ignition timer when the engine is operating et sueli :i slow speed that the generator output will not aieet the relay to closel the circuit between the generator and the battery, and adapted to connect the fuel pump with the pump 'timer 'when the ene'iiie is @new-tine et e o i. i

eientlyliigli speed 'to cause 'the output to eiect the eley to close the circuit between the end tlie iizitteiy l0. el fuel supply device ioi' en internal combustion engine previed with en eier-,trie generator; comprising in coinliiiieeieii, ii storage battery? e generator conti lied relay for closiiuw iii-e circuit between the generator and the etteiy vvi'ieiy the output seid generator lies ifeeoleefl e @reflet ,gein/esl value; en electric fuel pump; ignition pump circuit. interiupters incliniii'igg-oi.o^'iitv ing devices nao-unteoi en e comi on e riven siiet, the rai-tio oiE operano ie' the ignition inteerupter enel. ieve seid shaft being e prerleternjiined velu the ratio of operation lieti-veen the puin tei-rupter end said sheiit nei/@lotions ie e lessei velue; end Sivit-Shing device esencizitcd with the relziy for? eoniieeting. pump with the ignition timer tile speed of tiieengine ceueee the out eeiei reiey Wili be opereteti {iieeoiineet the generator' from tine lietteiy thi@ switching iey i., f f'i i,

in testimony x-vlieieof hereto iiix my signeteie, 4

i l JHN H. HUNT.

iii) 

